Dither Modulation in the Logarithmic Domain

Authors:
Pedro Comesaña;Fernando Pérez-González
Affiliations:
Signal Theory and Communications Department, University of Vigo, Vigo, Spain 36310;Signal Theory and Communications Department, University of Vigo, Vigo, Spain 36310
Venue:
IWDW '07 Proceedings of the 6th International Workshop on Digital Watermarking
Year:
2008

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Abstract

Scaling attacks are well-known to be some of the most harmful strategies against quantization-based watermarking methods, as they desynchronize the decoder, completely ruining the performance of the watermarking system with almost non perceptually altering the watermarked signal. In this paper we propose a new family of quantization-based methods, based on both Dither Modulation and Spread Transform Dither Modulation, oriented to deal with those attacks, and which presents another outstanding property: they produce perceptually shaped watermarks.